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MMLU / We were first able to accurately measure the diameter of Pluto from:

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question

We were first able to accurately measure the diameter of Pluto from:

choices

  1. a New Horizons flyby in the 1990s
  2. Hubble Space Telescope images that resolved Pluto's disk
  3. brightness measurements made during mutual eclipses of Pluto and Charon
  4. radar observations made by the Arecibo telescope

subject

astronomy

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